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Charge Breeding of Radioactive Ions in an Electron Cyclotron Resonance Ion Source (ECRIS) at

Proposal to the INTC Addendum to Experiment IS397 INTC-P-143 CERN – INTC – 2005 - 022. Charge Breeding of Radioactive Ions in an Electron Cyclotron Resonance Ion Source (ECRIS) at ISOLDE. Charge-Breeding Radioactive Nuclear Beams with the PHOENIX ECRIS at ISOLDE. Overview of

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Charge Breeding of Radioactive Ions in an Electron Cyclotron Resonance Ion Source (ECRIS) at

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  1. Proposal to the INTC Addendum to Experiment IS397 INTC-P-143 CERN – INTC – 2005 - 022 Charge Breeding of Radioactive Ions in an Electron Cyclotron Resonance Ion Source (ECRIS) at ISOLDE Dr. CJ Barton Department of Physics

  2. Charge-Breeding Radioactive Nuclear Beams with the PHOENIX ECRIS at ISOLDE Overview of Charge Breeding with the PHOENIX ECRIS Status of Experiment IS397 The Proposed Experiment Beam Time Request Dr. CJ Barton Department of Physics

  3. ISOL Technique with Charge Breeding 1+ Ion Source RNB Charge Breeding reduces size and cost of the Post Accelerator for Radioactive Nuclear Beam Experiments Separator Production Accelerator n+ Charge Breeder Thick, Hot Target Radioactive Nuclear Beam Experiment n+ Post Accelerator Separator n+ Dr. CJ Barton Department of Physics

  4. ISOL Technique with Charge Breeding 1+ Ion Source RNB Charge Breeding matches Maximum A/q of the Post Accelerator Bunching and Cooling Therefore: Lower Duty Cycle Power Consumption Separator Production Accelerator n+ Charge Breeder Thick, Hot Target Radioactive Nuclear Beam Experiment n+ Post Accelerator Separator n+ Dr. CJ Barton Department of Physics

  5. ISOL Technique with Charge Breeding • EU-RTD network • “Charge Breeding” • HPRI-CT-1999-50003 • Investigate Charge Breeding • in detail for both • EBIS and ECRIS • 2. Final Goal: • Install EBIS and ECRIS • at same ISOL facility • and compare performance PHOENIX ECRIS during commissioning at CCLRC Daresbury Laboratory. Dr. CJ Barton Department of Physics

  6. Electron Cyclotron Resonance Ion Source Hot Collisional Core Plasma Warm Collisional Edge Plasma CW or Afterglow (Ground) Non-divergent monoenergetic 1+ ion beam 0 V +HV 0 V (Ground) Confining Magnetic Field (High Voltage) Dr. CJ Barton Department of Physics

  7. Summary of Work at LPSC Grenoble Optimising ECRIS (PHOENIX at LPSC) Stable Beam Results Total Breeding Efficiency = 70% for both metallic and gaseous ions! Maximum single charge state efficiency = 5-10% Breeding time reduced significantly (25 ms Ag19+) Continuous significant improvement Dr. CJ Barton Department of Physics

  8. IS397 Status: Layout of Experimental Floor at ISOLDE GPS Dr. CJ Barton Department of Physics

  9. IS397 Status: Layout of Experimental Floor at ISOLDE FC/SCANNER 102 magnet ECR Double Einzel LENS FC/SCANNER FC/SCANNER Dr. CJ Barton Department of Physics

  10. IS397 Status: Charge Breeding Stable IonsBreeding Time 40Ar7+ (~ 50 enA) 200 ms 1 s Dr. CJ Barton Department of Physics

  11. IS397 Status:Charge Breeding Stable IonsBreeding Efficiency Kr 10.0 % 1.0 % Ar Xe Efficiency 0.1 % 2 4 6 8 10 Corresponding Argon Charge State Dr. CJ Barton Department of Physics

  12. IS397 Status:Charge Breeding “Stable Ions” – 238U 1.8% efficiency for 26+ Dr. CJ Barton Department of Physics

  13. IS397 Status:Charge Breeding “Stable Ions” C and O and CO CO2 CO+ B Field Molecular Dissociation • Molecular breakup • CO (CO2 tested) • ~ 0.3% efficienty • improved efficiency for heavier molecules? • efficient for molecules with radioactive ions? Dr. CJ Barton Department of Physics

  14. IS397 Status:Charge Breeding Radioactive Ions – Tape Station Apparatus • b detector (5 sided cube of scintillator) • 3 Ge g-ray detectors • Tape can survive a few mA of beam intensity • Einzel lens – beam focus on tape • Tape – continuous or discrete movements Dr. CJ Barton Department of Physics

  15. IS397 Status:Charge Breeding Radioactive Ions • Successful charge breeding of: • 94Rb14+ • 96Sr13,14,15+ • 130In • 130Cs • 46,47,48Ar • 92,94,96Kr • 138,142,144Xe • Efficiency for Sr charge breeding: • 96Sr15+ 3.1(6) % • 96Sr14+ 3.5(6) % • 96Sr13+ 2.6(4) % Ge detectors No Tape Station Ge detectors and Tape Station Dr. CJ Barton Department of Physics

  16. IS397 Status: Charge Breeding Radioactive Ions Beam purification of noble gas beams IS400 L.Weismann & J.Cederkäll • Multiple charged background • 48Ar1+, 96Kr2+, 144Xe3+ • Kr, Xe >> Ar • 48Ar2+, 24Ne1+ • Improve ratios through charge breeding? Dr. CJ Barton Department of Physics

  17. IS397 Status:Charge Breeding Radioactive Ions Beam purification of noble gas beams IS400 L.Weismann & J.Cederkäll Dr. CJ Barton Department of Physics

  18. IS397 Status:Background Challenge Isobars, support gas, Radioactive Gas (GPS), sputtering Dr. CJ Barton Department of Physics

  19. IS397 Status:Summary of Work at ISOLDE Charge Breeding stable ions as expected “normal values” obtained Charge Breeding radioactive Ions Charge breeding measured Must study half-life and efficiencies “beam purification” tested Challenges Radioactive background (higher vacuum needed) Stable background (A/q problems) Additional work in 2005 Installation of Moving Tape Collector from Daresbury Must work with radioactive beams Realistic conditions (contamination and intensity) Essential for 2nd generation RNB facilities (MAFF, HIE-ISOLDE, EURISOL) Dr. CJ Barton Department of Physics

  20. Addendum to the IS397 proposal:Overview of Goals • Pulsed mode for direct comparison with REX-EBIS • Afterglow method tests with stable beam • Afterglow experiment with radioactive beam • The charge breeding efficiency of different isotopes • Charge Breeding of the NUPECC elements • Charge breeding for three different chemical elements Dr. CJ Barton Department of Physics

  21. Addendum to the IS397 proposal:Goal - “Afterglow” Efficiency Trapped Ions Pulsed Beam DC Beam B Field Hot Electrons (From RF) RF On RF Off Afterglow Mode Measure: Breeding, Confinement, Extraction Time Determine: Breeding Efficiency for REX-ISOLDE cycle times Beam Request: Intense Stable and Radioactive Beams noble gas Ar, Kr, Xe alkali metals – Rb, Cs Dr. CJ Barton Department of Physics

  22. Addendum to the IS397 proposal:Goal - EBIS/ECRIS Efficiency Comparison Trapped Ions Pulsed Beam DC Beam B Field Hot Electrons (From RF) RF On RF Off Afterglow Mode Measure: Efficiency of charge breeding in “afterglow” mode Determine: Direct REXTRAP-REXEBIS comparison for radioactive ions accelerated at REX-ISOLDE Beam Request:88Kr, 138-144Xe Dr. CJ Barton Department of Physics

  23. Addendum to the IS397 proposal:Goal - Charge Breeding Efficiency Comparison of Elements Plasma desorption adsorption Plasma Vessel Surface Efficiency Comparison Measure: Charge Breeding Efficiency for different elements Determine: efficiency dependence of reactivity of elements Beam Request: 132Sn, 132Cs, 132Xe (isobar) Dr. CJ Barton Department of Physics

  24. Addendum to the IS397 proposal:Goal - Charge Breeding Molecule Fragments Se and O and C and CO SeCO1+ Se Ions B Field Molecular Dissociation Molecule Fragments Measure: Test Charge-breeding of Molecule Fragments Determine: Feasibility and Efficiency Beam Request: SeCO, AlF, HfF3, GeS, and CO Dr. CJ Barton Department of Physics

  25. Addendum to the IS397 proposal:Goal - Charge Breeding Refractory Elements Trapped Parent Ions Parent Ions Daughter Ions B Field Daughter Ions from Decay of Parent Refractory Element Beam Measure: Refractory Elements difficult to produce at ISOLDE Determine: trapping and breeding efficiency Beam Request: 98Sr (t1/2=650 ms, 220 eV recoil)– produces 98Y Dr. CJ Barton Department of Physics

  26. Addendum to the IS397 proposal:Goal - Charge Breeding NuPECC elements Measure: Charge Breeding Efficiency for NuPECC elements Determine: 1 Breeding to light elements (new) 2 Reducing background for low intensity beams Beam Request: Be, Na, Ar, Ni, Kr, Ga, Sn, Fr Reducing Background Light Elements Improve vacuum in GHM beam line Modify PHOENIX ECRIS booster (UHV ECRIS is being designed by LPSC) LPSC will test Na with Stable beams Dr. CJ Barton Department of Physics

  27. Addendum to the IS397 proposal:Beam Time Request 20 shifts with Radioactive Beams 15 shifts with stable beam (afterglow tests and runs) Time will be split as Parasitic and Group shifts Isotopes/Elements Stable Ar, Kr, Xe Stable Na, K, Rb, Cs Molecular Sidebands 88Kr,132,138-144Xe 98Sr, 132Cs, 132Sn NuPECC elements Shifts Parasitic Mode 3 3 4 3 - 7 Grouped shifts 2 3 0 3 7 0 Dr. CJ Barton Department of Physics

  28. Future: Utilizing an ECRIS at ISOLDE • The ECRIS in the framework of HIE-ISOLDE • New range of radioactive beam energy • HV Cage (platform) for experiments (few MeV) • Astrophysics and solid state • New charge booster for REX-ISOLDE • No more limitations in ion intensity. • Reliability and simplicity. • No charge exchange problems. • The ECRIS in the frame of EURONS and EURISOL • Comparison of EBIS and ECRIS techniques • Background improvement, UHV ECRIS • Continued development and expertise • 60GHz ion source for the b-beam scenario Dr. CJ Barton Department of Physics

  29. Proposal to the INTC Addendum to Experiment IS397 INTC-P-143 CERN – INTC – 2005 - 022 Charge Breeding of Radioactive Ions in an Electron Cyclotron Resonance Ion Source (ECRIS) at ISOLDE C. Barton1, K. Connell4, P. Delahaye6, T. Fritioff6, D. Habs2, C. Hill6, O. Kester2, P. Jardin5, T. Lamy3, L. Leroy5, M. Lindroos6, P. Sortais2, A. Villari5, D.D. Warner4, F. Wenander6 and the EURONS charge breeding collaboration 1 University of York, United Kingdom 2 Department für Physik, LMU München, Germany 3 LPSC Grenoble, France 4 CLRC Daresbury Laboratory, United Kingdom 5 GANIL, Caen, France 6 CERN / ISOLDE, Switzerland Spokesperson: C. Barton Contact person: P. Delahaye INTC meeting, 23/05/2005 Dr. CJ Barton Department of Physics

  30. Summary of Work at CCLRC Daresbury Optimising ECRIS Field Mapping Tuning Parameters Results Normal mode of operation Tested efficiency Maximized extracted current Injection Mode for Charge Breeding Breeding time Total Breeding Efficiency Maximum current DV tests, alignment & steering, other parameter tests Transfer to CERN for charge breeding experiment Dr. CJ Barton Department of Physics

  31. IS397 Status: Development of the ECRIS at ISOLDE • Enlarged HV Break for operation > 30 kV for transmission efficiency • Teflon RF window outside ECRIS for higher power operation • Indium O-rings in waveguide • Slits at focal plane of magnet for improved mass resolution • Installation of b detector, gdetectors and tape station • Improvements to control system • Improved performance and reliability Dr. CJ Barton Department of Physics

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